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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 21 — Jul. 20, 2000
  • pp: 3691–3703

Measurement of the Refractive Indices of H2SO4-HNO3-H2O Solutions to Stratospheric Temperatures

Ulrich K. Krieger, Juliane C. Mössinger, Beiping Luo, Uwe Weers, and Thomas Peter  »View Author Affiliations


Applied Optics, Vol. 39, Issue 21, pp. 3691-3703 (2000)
http://dx.doi.org/10.1364/AO.39.003691


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Abstract

Refractive indices of various H<sub>2</sub>SO<sub>4</sub>–H<sub>2</sub>O, HNO<sub>3</sub>–H<sub>2</sub>O, and H<sub>2</sub>SO<sub>4</sub>–HNO<sub>3</sub>–H<sub>2</sub>O solutions were measured at four wavelengths in the visible (351.0, 533.5, 632.9, and 782.6 nm) over a temperature range from 30 to −60 °C. The temperature dependence has been determined for the first time to the authors’ knowledge. This dependence is of importance for applications to atmospheric aerosols at low temperatures. In particular, it is shown that (1) the molar refractivity of the solutions is independent of temperature, whereas the temperature dependence of the refractive index arises solely through the temperature dependence of the solution’s mass density, (2) the molar refractivities of H<sub>2</sub>SO<sub>4</sub> and HNO<sub>3</sub> in a ternary solution may be calculated as the weighted sum of the molar refractivities of two binary solutions evaluated at a concentration that corresponds to the total acid concentration, and (3) the H<sub>2</sub>O molar refractivity in the solutions may be taken equal to that of pure water. Although the data for the ternary system have been used for this model verification, data for binary H<sub>2</sub>SO<sub>4</sub>–H<sub>2</sub>O and HNO<sub>3</sub>–H<sub>2</sub>O solutions were used to improve the accuracy of the modeled refractive indices to better than 0.0017% or 0.15% for concentrations of 5–70 wt.% and wavelengths from the near ultraviolet to the near infrared (0.25–2 μm).

© 2000 Optical Society of America

OCIS Codes
(010.1100) Atmospheric and oceanic optics : Aerosol detection
(160.4760) Materials : Optical properties
(280.1100) Remote sensing and sensors : Aerosol detection

Citation
Ulrich K. Krieger, Juliane C. Mössinger, Beiping Luo, Uwe Weers, and Thomas Peter, "Measurement of the Refractive Indices of H2SO4-HNO3-H2O Solutions to Stratospheric Temperatures," Appl. Opt. 39, 3691-3703 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-21-3691


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References

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  26. A copy of the fortran code (or alternatively a java code) can be obtained from the authors. Send an email to krieger@atmos.umnw.ethz.ch.

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